chore: modify keycloak healthcheck endpoint for newer keycloak #1458

Job	Run time
test-suite (active-standby-kubernetes)	16m 37s
test-suite (api)	18m 10s
test-suite (deploytarget)	16m 14s
test-suite (features-kubernetes)	19m 25s
test-suite (features-kubernetes-2)	24m 2s
test-suite (features-variables)	12m 49s
test-suite (services)	12m 48s
test-suite (tasks)	16m 8s
	2h 16m 13s

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